Find the Torsion of the Space Curve $\tau = - \frac { \tanh ^ { 2 } t } { 2 }$

question 19

Multiple Choice

Find the torsion of the space curve.
-r(t) = (cosh t) i + tj + (sinh t) k

• A) \(\tau = - \frac { \tanh ^ { 2 } t } { 2 }\)
• B) \(\tau = - \frac { \operatorname { sech } ^ { 2 } t } { 2 }\)
• C) \(\tau = \frac { \tanh ^ { 2 } t } { 2 }\)
• D) \(\tau = 0\)

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